Engine cylinder head

Abstract

Two embodiments of cylinder head constructions including drain passageways for draining the sealing area of a spark plug of water. In one embodiment, the drain passageway is formed when the cylinder head is cast and in the other embodiment, the drain passageway is machined into the cylinder head.

I claim: 
     
       1. In an internal combustion engine comprising a body of said engine defining a spark plug recess opening surrounded by a recessed sealing area that is inclined to the vertical, the improvement comprising a drain passage extending downwardly from said sealing area to drain any accumulated fluid therefrom. 
     
     
       2. In an internal combustion engine as set forth in claim 1 wherein the recessed sealing area defines a well and the inlet portion of the passageway intersects the lowest portion of the well. 
     
     
       3. In an internal combustion engine as set forth in claim 2 wherein the drain passageway is formed as a recess in an external surface of the body. 
     
     
       4. In an internal combustion engine as set forth in claim 2 wherein the drain passage comprises a drilled passageway intersecting the well. 
     
     
       5. In an internal combustion engine as set forth in claim 1 wherein the body of the engine comprises a cylinder head. 
     
     
       6. In an internal combustion engine as set forth in claim 5 wherein the recessed sealing area defines a well and the inlet portion of the passageway intersects the lowers portion of the well. 
     
     
       7. In an internal combustion engine as set forth in claim 6 wherein the drain passageway is formed as a recess in an external surface of the body. 
     
     
       8. In an internal combustion engine as set forth in claim 6 wherein the drain passage comprises a drilled passageway intersecting the well.